Wireless Target Identification - Arduino Transmitter Code

Transmitter.pde

int piezoPin = 0;
int piezoThreshold = 40;
int piezoVal = 0;
int array_of_dip[10];
int id_of_sensor = 1;

void serial_print()
{
  Serial.print("<");
  Serial.print(id_of_sensor);
  Serial.print(">");
}

void identify()
{
  array_of_dip[1] = digitalRead(2);
  array_of_dip[2] = digitalRead(3);
  array_of_dip[3] = digitalRead(4);
  array_of_dip[4] = digitalRead(5);
  
  for(int i = 1; i <= 4; i++)
  {
    if (array_of_dip[i] == 1)
      id_of_sensor = i;
  }
}

void setup() 
{
  pinMode(2, INPUT);
  pinMode(3, INPUT);
  pinMode(4, INPUT);
  pinMode(5, INPUT);
  pinMode(13, OUTPUT);
  Serial.begin(57600);
  identify();
}

void loop() 
{
  piezoVal = analogRead(piezoPin);
  
  if (piezoVal >= piezoThreshold) 
    serial_print();
}